The MAX8821 white-LED (WLED) driver combines a negative charge pump with a fully differential bridged audio amplifier and two low-noise LDO current regulators. To maximize efficiency, this LED driver features a negative architecture that completely eliminates high-side, in-line switch resistance loss in 1x mode, delaying 1x to 1.5x mode transitions during battery discharge.
The device drives six WLEDs with 1% accurate current matching and supports I2 C dimming control with 32-pseudo-logarithmic dimming levels. Additional features include a quiescent current of 70 μA and a PSSR gain of 66 dB at 1 kHz. Its Class D audio amplifier delivers 2 W to the speaker differentially by the use of a bridge-tied load (BTL) output stage while the dual LDO regulators deliver over 200 mA of current output with 45-μV noise and 60-dB PSRR for sensitive circuitry. (From $2.55 ea/1,000—available now.)
Maxim Integrated Products , Sunnyvale , CA
Customer Service 888-629-4642
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